Worth



DOOR-LATCH.

Specification of Letters Patent No. 1,507, dated March 6, 1840.

T0 all whom it may concern Be it known that I, BENJAMIN M. BoswoRTH, of VVarren, county of Bristol, and State of Rhode Island, have invented a new and useful Latch and Lock for Securing Doors, which is described as follows, reference being had to the annexed drawings of the same, making part of this specification.

Figure 1 is the outside of the door represented as closed and showing the latch locked behind the catch, which is let into the door casing in the usual 'manner, and also one of the handles and the key hole. Fig. 2 represents the handles and the shaft which connects them together and circular plates placed between the handles and door to prevent wearing or rubbing the door. Fig. 3 represents the stock, latch, end of the bolt, spring, one of the circular plates and shaftthe bolt being unlocked, or thrown back. Fig. 4 represents the stock with the front plate removed in order to eX-pose to view the whole of the latch and a projection from the under side of it and the bo'lt for locking the latch and the spring under the bolt for steadying it,-the bolt being represented as locked or thrown forward. Fig. 5 represents a key. Fig. 6 represents asingle latch without the bolt for locking it, the stock containing it being made much smaller than the other.

Similar letters refer to similar parts in the figures.

The door A, handles B, casing C, catch D, and key E, are made in the usual manner.

The stock F, when designed for a latch with a bolt, is cast of iron or brass about two inches deep, one inch wide at top, one and an half inch wide at bo-ttom-half an inch thick and hollow to receive the latch, bolt, and spring; and perforated through the face with an oblong mortise to allow the latch to extend through the stock and beyond the face sufficiently far to take hold of the catch in the usual manner of latches which catch on the under side. The .face of the stock projects beyond the top and bottom of the stock to form flanges for screws to pass through to secure it to the door. A mortise is made in the edge of the door to receive the'stock, latch and bolt and is of An oblong mortise is made transversely through the door running up and down a suflicient distance to admit 'the' shaft I of the handle B, (over which-the latch G is placed) to move freely up and down therein in order to raise the long arm of the latch and depress the short arm and thus detach the` short arm from the catch-in the door caslng. f

A slot is made in the Washers fromthe center extending upward to allow 'the shaft to move therein, with screw holes in the washers to fasten them to the 'door so asto hold the shaft about T1511 of an inch below the latch when it is latched.

The door is latched in the following manner.-In closing the door the shorter end f of the latch in passing under the catch, which is an inverted inclined plane, descends and lifts the longer end and as soon as the short end has passed the catch the long end descends by its greater weight and raises the shorter end and hooking it behind the inclined catch,- the latch assuming an horizontal position and resting over the shaft of the handles and nearly touching it. To unfasten the latch the handles and shaft are raised together which elevates the long end and depresses the short end and disengages itfrom the catchthe shaft moving in the oblong mortise in the door. In order to lock the latch with a key and bolt a projection K must eXtend down from the under side of the latch G about th of an inch, under which an horizontal bolt L, of the usual the latch from being depressed and the long end from being raised and thus will be locked as rep-resented in Fig. 4 until the key is inserted and turned and the bolt thrown back again to its former position' as i reloresented in Fig. 3. The ;spring 'under the boltfs designed to keepthe bolt pressed upWardagainst a smell Vpin Nzfor holding it steady. The before Vdescrbed proportions and dmensions may be Vared. ,i

W hat I clrzum as my mventlonVV a'nddeslre to 'secure by Letters Patent 'conlsts in,-

The before described mode of disenggng'- the latch from thecatch by msing the han- Witnesses: w

dles and shaft perpendicularly in an oblong 10 Vertical slot in the door andthus causing the shaft to mise the longer end of the latch and depress the short end so as to disengage it frolfnthecatch.`V o BENJAMI BOSWORTH.

WM, REIOT,

' EDMUND .MAHER.` 

